Yesterday I have bought this Siemens Zeitmesser M 09005-A23-A1 at the DNAT swap meet in Bad Bentheim (Germany).
After cleaning it seems a nice looking device. Since I do not know that exact use of this measurement device I hope that someone on this forum can help me. I think this device was used to measure timing of relay contacts. Its resolution is 10ms with the maximum of 99.99s. It also includes an additional adapter for 220/110V.
I believe 2 contact timings can be checked and the connectors at the top are: Ground, Contact 1, Contact 2, Reset. With the two switches at the left you can setup the configuration Normal Open (NO) or Normal Closed (NC). The 3 switches on the right are Show Time Contact 1, Contact 2 and Manual Reset.
Could some confirm the above ?
![](https://www.eevblog.com/forum/testgear/siemens-zeitmesser-m-09005-a23-a1/?action=dlattach;attach=1256545;image)
![](https://www.eevblog.com/forum/testgear/siemens-zeitmesser-m-09005-a23-a1/?action=dlattach;attach=1256551;image)
I have not switched on the unit yet since I do not have the power cord. Also I am wondering if it actually used mains (220/230V) and tried to open the unit unsuccessfully. I could open the the back lit, but all was show was a flat heat sink I could not move the PCB out of the housing. With some strong light I could see that there is a transformer in the bottom part of the unit and some vents in the back and side of the casing in that area. The heat sink has a TO220 device mounted upside down so this could be a voltage regulator.
Does anyone know which plug is used here and if it is for mains voltage ? The pin spacing is 7 mm.
![](https://www.eevblog.com/forum/testgear/siemens-zeitmesser-m-09005-a23-a1/?action=dlattach;attach=1256557;image)
Hope that someone has some more information and maybe even a manual or schematic.